[exim] Forward outgoing email

I need to push all outgoing email for certain domains via another
server, so I have added the following to the beginning of the router
section:

redirect_domains:
driver = manualroute
domains = domain1.com : domain2.com
transport = remote_smtp
route_list = outgoing.server.com

I still see that the mail for the 2 domains is getting delivered
directly.

Paulo